A portal into the bricked up canal that runs through the heart of Washington D.C.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

A much-maligned monument to teetotalism.

Washington's iconic carousel has a nice piece of Civil Rights history.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The most accurate timepiece in the world.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Head past the aisles of tropical fruit and imported candy at this bodega to discover a hidden, weekends-only taco stand.

Nine nice parcels of land along a flight path offer a quiet respite... until a plane soars overhead.

The first Catholic church in Singapore is a Neo-Gothic colossus with a rich architectural history.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

One of Kyoto's oldest food establishments has supplied soba noodles to temple priests and the Imperial Palace.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The spot where Oxford garnered its name was also home to a medieval philosopher and includes a house covered in statues.

Inside this curiosity shop, visitors can peruse the clown collection or purchase a molar from the mouth of Bigfoot.

These tiny pine-covered islands have inspired art and poetry for centuries.